That's exactly how I see it too. "I think" is more like a suggestion. It makes you come off as less confrontational. If I wrote "The #1 rule is to write more"

That's exactly how I see it too. "I think" is more like a suggestion. It makes you come off as less confrontational. If I wrote "The #1 rule is to write more" then suddenly my tone switches to: "I'm an authority on the subject and this is a fact". That is not what I wanted to say here. This is why communication is so interesting. Very subtle changes can completely change the tone of a message.